AS THE CLOSEST AND ONE OF THE OLDEST ACCESSIBLE OPEN CLUSTERS (47 PC 625 MY) THE HYADES IS A BENCHMARK FOR STELLAR ASTROPHYSICS. MANY HYADS WERE HIPPARCOS TARGETS ALLOWING FOR PRECISE ASTROMETRIC AND ABSOLUTE PHOTOMETRIC CALIBRATION. MORE THAN 50% OF CLUSTER MEMBERS HAVE BEEN SURVEYED FOR BINARY COMPANIONS AND MANY FOR PLANETS AS WELL. HYADS HAVE BEEN USED TO TEST STELLAR MODELS AND TO CALIBRATE GYROCHRONOLOGY AND METALLICITY SCALES. WHILE THE HYADES S PROXIMITY HAS ENABLED THESE DETAILED STUDIES OF ITS MEMBERS IT HAS ALSO HINDERED MEASUREMENTS OF THEIR ROTATION PERIODS. HYADS ARE SCATTERED ACROSS>3600 SQUARE DEGRESS OF THE SKY. GROUND-BASED EXPERIMENTS THAT MEASURE STELLAR ROTATION PERIODS TYPICALLY HAVE SMALL FIELDS-OF-VIEW WHICH PREVENT THEM FROM OBSERVING MORE THAN ONE OR TWO HYADS AT A TIME. THE RE-PURPOSED KEPLER MISSION K2 HAS SIGNIFICANTLY INCREASED THE NUMBER OF PERIODS MEASURED FOR HYADES STARS BUT EVEN WITH TWO K2 CAMPAIGNS WE HAVE STILL ONLY SURVEYED THE CLUSTER'S CORE FOR ROTATION. EXPANDING THE NUMBER OF HYADS WITH MEASURED PERIODS IS CRITICAL TO CALIBRATING THE RELATIONSHIP BETWEEN AGE ROTATION AND MAGNETIC ACTIVITY FOR LOW-MASS STARS. WE HAVE KNOWN FOR 45 YEARS THAT ROTATION AND ACTIVITY (AS MEASURED FROM PROXIES FOR MAGNETIC FIELD STRENGTH SUCH AS HALPHA EMISSION OR X-RAY LUMINOSITY) DECREASE WITH AGE FOR SOLAR-TYPE STARS. A WELL-CALIBRATED AGE-ROTATION-ACTIVITY RELATION (ARAR) WOULD ALLOW US TO OBTAIN THE AGES OF FIELD STARS FROM ROTATION AND/OR ACTIVITY MEASUREMENTS. UNFORTUNATELY AN ACCURATE QUANTITATIVE DESCRIPTION OF THE ARAR STILL ELUDES US PARTICULARLY FOR THE LOW-MASS STARS THAT ARE TURNING OUT TO BE SUCH PROMISING HOSTS FOR HABITABLE PLANETS. WE PROPOSE TO OBTAIN TESS LIGHT CURVES FOR EVERY ACCESSIBLE MEMBER OF THE HYADES. WE EXPECT TO MEASURE NEW ROTATION PERIODS FOR>200 HYADS WITH TESS DATA PRIMARILY FOR STARS IGNORED BY PREVIOUS ROTATION SURVEYS. BECAUSE THE HYADES IS ONE OF THE NEAREST AND THUS BEST-STUDIED OPEN CLUSTERS EMPIRICAL CALIBRATIONS OF THE ARAR OFTEN INTERPOLATE DIRECTLY BETWEEN THE OBSERVED PROPERTIES OF HYADS AND THOSE OF THE SUN. OUR TESS DATA WILL THEREFORE BE CRITICAL TO IMPROVING THE ANCHORING OF THE ARAR AND WILL BUILD ON OUR EXPERIENCE WITH GROUND- AND SPACE-BASED SURVEYS FOR ROTATION.